This idea grew out of a visit to the Christmas Shop in Stratford on Avon where there were many, many plaques on display.  Himself bought some MDF board and cut out a pile of blanks.

Closely supervised by the dog.

Some had holes drilled in the top but not all because I wanted to experiment with hooks in the top too.

And you don't have to focus on Christmas.  This one was done on card with a selection of small stamps.

The video shows you how the plaques were made.  I hope it gives you some ideas for what you could do.  Enjoy :)